Migrate to Styx thumbnails in Files App.

chrome/browser/chromeos/extensions/file_manager/private_api_drive.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/extensions/file_manager/private_api_drive.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/chromeos/drive/drive_app_registry.h"
 #include "chrome/browser/chromeos/drive/drive_integration_service.h"
@@ skipping 39 matching lines @@
     api::file_browser_private::DriveEntryProperties* properties) {
   properties->shared_with_me.reset(new bool(entry_proto.shared_with_me()));
 
   if (!entry_proto.has_file_specific_info())
     return;
 
   const drive::FileSpecificInfo& file_specific_info =
       entry_proto.file_specific_info();
 
   properties->thumbnail_url.reset(
-      new std::string(file_specific_info.thumbnail_url()));
+      new std::string("https://www.googledrive.com/thumb/" +
+          entry_proto.resource_id() + "?width=500&height=500"));
   properties->is_hosted.reset(
       new bool(file_specific_info.is_hosted_document()));
   properties->content_mime_type.reset(
       new std::string(file_specific_info.content_mime_type()));
 }
 
 }  // namespace
 
 FileBrowserPrivateGetDriveEntryPropertiesFunction::
     FileBrowserPrivateGetDriveEntryPropertiesFunction() {
@@ skipping 553 matching lines @@
     error_ = "Share Url for this item is not available.";
     SendResponse(false);
     return;
   }
 
   SetResult(new base::StringValue(share_url.spec()));
   SendResponse(true);
 }
 
 }  // namespace extensions